Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6bddcaee7ef5fb…

MALICIOUS

PDF

71.0 KB Created: 2021-03-28 21:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fc1fc516d2f6bcd55968a5da2c6ecbe8 SHA-1: 490d1476dad6ba5312fb47f4a5f3c9c9d8d7eb21 SHA-256: af6bddcaee7ef5fb115321db317246571546087d0299eeed389aaa8003c7c1b0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary URL, https://mezovuduw.ru/wix?keyword=salween+thai+menu, suggests a potential phishing or scam lure related to a menu. The PDF structure and link farm behavior are consistent with techniques used to distribute malicious content or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wix?keyword=salween+thai+menu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499653/normal_5fd9c91e1cf6d.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/dijuxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393628/normal_60566713bde19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_604d2bba024df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_602a87f709f84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_6003f33f6b195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_604acab8398f0.pdfIn PDF document text
    • https://ximafirufiwazi.weebly.com/uploads/1/3/4/7/134755441/kopadiduzifezo-bujujemavakabil-dibofugogas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_6036dc9946b58.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/38ed667d8f0.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/6f11d04c82.pdfIn PDF document text
    • https://wejanorop.weebly.com/uploads/1/3/2/3/132303338/bebefazuferad.pdfIn PDF document text
    • https://zosonokabawim.weebly.com/uploads/1/3/4/3/134316026/7565386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_601c8d04997e6.pdfIn PDF document text
    • https://wewokidopubix.weebly.com/uploads/1/3/0/8/130873978/vixijugod-wobiba-zarijibibi-fiwonesuwoparev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_60329ed19c495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32297074-25c6-44f5-8e8b-a1149b28d95e/1235338566.pdfIn PDF document text
    • https://86cafecd-0af7-43e6-b578-14605c742a6c.filesusr.com/ugd/c4ddd0_673d1bc66a884b30864001ed85e33e6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcbf2f8-3855-40d3-a35b-8639f5f1dc4c/roraxubapurimojivufetu.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_45f1c60b0e6043b4bea11c4b7e77e47d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09193639-67b3-4d59-aae5-1d417fe78d6c/fujuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 4844 bytes
SHA-256: 30235bcac98f4761a547b8511b3a52a20814e659223676562f4c460eb179f8d3
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 11320 bytes
SHA-256: 6ded20179ebd03200c8f74f00dce85d817826ca7a86112bc1660a3e35d5ff754